AML NGC3, Руководство пользователя

Страница: 33 / 37

© Arun Microelectronics Ltd 2020. All rights reserved Page 33
14.9. <status> Status report
The status report gives the operating status and pressure of each gauge in the NGC3.
State byte: See section 14.7.
Error byte: See section 14.7.
Relay status byte: The relay status byte is of the form 0100XXXX2, where the least significant 4 bits indicate the state
of relays A to D (1 = energised) with relay 'A' indicated by the least significant bit.
An unused byte: ‘0’
Gauge record: For each gauge in the NGC3:
Byte Name Details
1 Header byte ‘ G ’
2 Gauge type ‘ I ’ : Ion Gauge
‘ P ’ : Pirani
‘ M ’ : Active Gauge
3 Gauge number ‘ 1 ’ : Ion Gauge 1
‘2’: Pirani 1
‘3’: Pirani 2
‘4’: Active Gauge
‘5’: Ion Gauge 2
4 Gauge status All bits are set to 0 unless stated otherwise:
Ion Gauge Status
Bit 0: gauge in emission
Bit 1: 0
Bit 2: gauge controlling bakeout
Bit 3: gauge in degas
Bit 4: 0
Bit 5: filament 2
Bit 6: 1
Pirani Gauge Status
Bit 0: gauge operating
5 Gauge error Ion Gauge error
Bit 0: filament open-circuit
Bit 1: overemission
Bit 2: underemission
Bit 3: overpressure
Bit 4: Interlock/Autostart prevents starting
Bit 6: 1
Bit 7: Filament/leads
Pirani Gauge error
Bit 0: Pirani Gauge open-circuit
Bit 6: 1
Bit 7: 0
6-13 Pressure Comma-delimited string in scientific notation, e.g. "1.3E-07," If the gauge is
not operating the string consists of spaces only.
14 Units ‘T’ = Torr, ‘P’ = Pascal, ‘M’ = mBar
15 Unused ‘0’
16-17 CR-LF
Bake Temperature: Three bytes of temperature followed by ‘C’
CR-LF